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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878a2cd6dd6f89b20b70f561ed84d8bb454e07edd6c9a887c7540ae83db2fd7f' 
  AND token = 'VdfIT4nevrtDK9kzsC6JphaVuwLdCRBCyx3Qb9m7Ss0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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