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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531809e707eeca6f2df4149e947a50419644f4e9a567f68470df4307dd18a482' 
  AND token = 'ZUgNWfrW/p5e9zL4j/HgSnPF8KM8KwWvuukzj8CxMCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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