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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c841565d11f97d5040be0b00c4ef7ceaf89ae9f70ca7529e02d31ffe47b6a1b' 
  AND token = '64fv1Jt3uAeC4cYBlAO/KJdDjdPaHplU6ex3topxma0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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