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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f82156bbf52c562c5bdf307acc223213a3fc2629900d0b19ef35c37b9dfc12' 
  AND token = 'YQ962wxmqWkRs0hV2uXw/6wGBUPKn/TPl3Iy/Gs0Lbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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