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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1702b792b839a4180e54c66570cad40c2513b1d2fe6d5d32c36fb1cdf5e70d' 
  AND token = 'tkxYEGSwgwkSLzxRrArcSR8opM2a3z3pK9dWhDJbRuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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