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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c4004dd86acc232f51504ef7daa754d2612b149cf3f626117a635aa6e824f2' 
  AND token = 'CCOi2v59fgh22NkuSVwDrVXg60LFuY+LH97nnygohUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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