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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c820a5c8dad6a3a1d44cf6e1878ea0df37dfbafcf9595a927fc9f72718c5ecc0' 
  AND token = 'zLwowfZ8LqN1REixDxMwXUHF4uZnM+lEgA5/03JJTmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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