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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d26a872d51bda01d0ea00021b5569b1460600cb96691ba526b1631084e1dc9d' 
  AND token = '66Oq8E6TP9TvvK06+Z+HnGXIbtbRmvsWJEi2/aa1w9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}