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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cda3d602b70251b3608c44b44385623c11b773c32180396fb85cc611eb5e8d4' 
  AND token = 'V0Gni6px5ELNcnWIkH2en9xuvAvj7BoOFTuPTxW39ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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