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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bc48f260a684c722cf0d634c6895c677e2e3e301aa79edd717362a2df7f553' 
  AND token = '1L+eNy9beZepB0bI0+fgHTngB2kc+c9/76arvKOgo9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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