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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6327b1cfe63df1103b0375b47787f63de86ec582a3cafa91f708d91040f7bd2' 
  AND token = 'e2wA6cpnqSOQ5VOJG6LkgRe0iP+N7vdbZVyk7gGxoHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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