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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7052642364b661e61e9ec0679354b54463fa7565e04574cd8735e39e6202b7' 
  AND token = 'iITYAPi9LeR4SHL2NMQedIiJbo8N8uSSfvk1PBXr4lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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