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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfc6569a90284161cae17f35a9ac17485ba425c21c09f74cd4588f59f185abc' 
  AND token = 'pvM17iKIAzbpKi9C2SLIGIB0w6HL5wSo/RVd22t8Oso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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