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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3260e743a28eff645a0c92b1ed694e31d6cde06a26579a1c1d5632242cb395' 
  AND token = 'N0/BfUcKDxRThPCS2vqMjorXXgkDX/Td2ACxO8G5q9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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