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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a2454bac66cd51046f41141acb29aeaaac87ec8197c394b5cc4d2a46e21cad' 
  AND token = 'BGZjqCh4p4QLXyVcS3fcaQlQCF+5wZt66V9IG+GYlaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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