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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90839dc842a1c2b3d419ba04099b588c2ad279501f3014e10d7c14162bcf24e0' 
  AND token = 'NnvTl3E9sAxfK/kfk/uk1UFOuuZUyGm5daZUugJUTN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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