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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3548320fca24e35d10b15e7a1efc0cb40c7cd71abe82fdc2364f22dbf9f76d' 
  AND token = 'TIEGl44SehJxl3T3cN1FvgwCVyxY0uqCMu+IODxg54g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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