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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ed4eb07e7c702b6eee08032eb6d66e57551f8b147dd6766ea6ede1263d7752' 
  AND token = 'ncWFS+nv1bpUo2CHC9J2Ozngev80xjNoB74JDjLAPaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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