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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcb037f971e836d4d0f3fe6705a58a890f4c60622d144e581cd2d7f2ff97864' 
  AND token = '4W5xFM0MAJ+HXB+WAdnnSMcOTy0m0SKN/0d67+ELMII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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