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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccadb470cf687a2d3539f903991e8773ac11ec07a77029efa6b04589fc9df6d2' 
  AND token = 'whmSixcJC6pIMxXuGu7UmfoFXfAGjCjzDV6OtB0vdv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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