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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99ffe7b0a32630b697ab697e6ba5da72e3601f325dfebd933969855c71723b0' 
  AND token = 'KNPgY/KdEIH1Nvcd4ShkVRZ/afBOiLhikEugvK5r/Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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