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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acbf6fade5e655420d87aeaa5674ec51128543550003b0f588cb8803bc28dd8' 
  AND token = 'oD9Pg9opwcai08jla631WKnfL7+fxMIBK5XwNEysBKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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