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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4555198a7a2c2b68e6658a6e21b274c1a99c33e863e3b4a886f4c7b712a6df3' 
  AND token = 'cCbzOac3NFaaJaqQuFimYaZPpNaWvzVLMDAL0F5wU+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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