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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5295972c026ccb97b802b0e3e10764b32fd8ee5b8f6dce8571a1b326404195' 
  AND token = 'UyEpJ8MQZiE6xul2ljERqAwuzpfXk5XLaubTrLHI0Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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