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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaff4cfcfb8669533d3aaca6d2a83d0a3fcae133c4d94978ac6349276388c40' 
  AND token = 'yqZeMqtJGnHgrFf2YfD2gJBc+9popwMt1KXf70wpFd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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