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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a75c094d9d8d2167eb6b6679ce68ce48d3801c2d974cb49b208660cd6a70ca' 
  AND token = 'N8VcmrZwhUpdfuciSPy4BPeFR4UaWd2alKyVjHVQHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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