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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ffed9e06f8c8fbb958427d46b1cd546cc92647282556d6684b1dde785a5ecd' 
  AND token = 'U+duzNm8F+WDZCnhuMuL0joLzIhblDK01OwCKbeVF0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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