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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626adbc4cc24f02798734a562ef98e09f5cebaea55f33fffe94a2a739ddd04de' 
  AND token = 'FbSF5HzsMbRXjwGIVwzIRLvddJDm4shaTCRWBTcBI/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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