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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f77c91ab98113b59a655c496ad8f6062703f7f8121102503b82473f9a6c325' 
  AND token = 'A4q1NdJnA9miaKTiN7N9UnwRYXQx3XzKjTkIKGaWvS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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