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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8d31661d140521a3876cd8975294b4809430cf9df2470592faae7697fa4ca6' 
  AND token = 'PauP4jfpEF+K5E7IiDYr8QD8r8zQVO+s4gc7AI0+JoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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