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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe17438170ea16efc25e58b59df6f21de2c8270350ddda589dba6f536378a6a' 
  AND token = 'd0KCgHIp0SkuG66ekwmc023OGsaaw6IgqYKPSxQl9hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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