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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758e4f604cc9192279d377f5ce873905325c527a44065c7d5f958a9b65ac5be3' 
  AND token = '9q2yX2tQwouX0Q8PBBnsvKVR3eLy9N4mte/AvQloMFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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