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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2f6a6bc9601fadddc466349722d1d9489354f422efd810dd14e1e90441c5c1' 
  AND token = 'weIXvvmnkvGgD2rEz9ztx/Al0GA43mepQAk8W5d0vfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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