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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7208c9178696fb9626e318b35d303b3c05bd3403d34cadb23370f4fed7237ed0' 
  AND token = 'ehZReg3fs0BMdYO11rTntcXUkhxClR2j02Ik1K1eSUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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