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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fbc970944e60eb6c3715e3cbda4f79293fabd9d2d3f5c939fb9cc2503cf2d3' 
  AND token = 'fddOXYCCotqh0V5/mf8RLPC+3OxdNUvj1kYUA7e4/5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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