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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0511f66c240c09bd46e2c7c2012e65885af340ebba9a4660679c99794e876ef9' 
  AND token = 'foODb86XNuwNe7+drtxqx63se2trXg7ystNOlBO7wzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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