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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0572e47f791bc05f4291cbc3f358488fa7c7c6e81b867e6d95b9beccddf83613' 
  AND token = 'HGALM8NkXjw4N+APaFfup17tj+gnmPyP+M0BOp0Kv6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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