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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b55eac7e833bb894817eb4ceadc991e12513b6520776d46c79cbf5427ca93d0' 
  AND token = 'AwGXIKBTnP8IBylt6Uv80l4lN/9EPRyb5FDavxhsG0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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