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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce5f58b58ea2ee77d1c57b866f0535bb149104801d691bd754dca7b1ac555dd' 
  AND token = 'RPLnGFhD6zHfA/OL8Eqyumxn64vXjt/zx2Tw1sU560Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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