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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b47fb622199e50078e2eb4d116579f4988b18e4f79d726dbfc8a6a75e347f9' 
  AND token = 'h4T5wcySzwJjErcALNcxCAQb+FpqJah3C4hKK6lEf2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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