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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21979dc47851f4f10dfeaa1e6ec7154c9a432d2d3f00d53160cd04725c969992' 
  AND token = 'yhyA2iX3Xp8xcmXWm4nqnxWkG1aDof0UL4VArLhYV6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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