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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e294c5e7cda21451dc696a9b80c7791ecd95c0a8db81176fdb6c02240c8171' 
  AND token = '5Abuqu7bFFpnFr5G+P9xV1m89D6VRJwFz6uXFJMH0mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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