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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669e65e45562c91918ac0462a100c5eaa3d20562c9c264d3e145094f1c66e99e' 
  AND token = 'sTbbmvqQGh9v2L3s+5gGdMsHCNWIE+wQG9YAfFtZsig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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