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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3ba572b3e333cbe071d9f79531472958ce42db2fc00ca61c28172583f45bf5' 
  AND token = '3S8oBi/OydNp88JK/HlcNW7hQZPB/0TpWBHVNjR4K44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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