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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0465bb230d0c22b29b8f53a353c929040c80e2c74f35154f5eb52be52ac6c5' 
  AND token = 'VUYgpSEBMMTZG1C/9ggXASeZypusQYxqJtql62OG/5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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