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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f044943e38d931fb6e90f5d516781fcce0e70b2f56395a8b33aa2d99a453f4' 
  AND token = 'u2i2SKHFPFPTOOPe7heKHR9FhtuthH0GqLea5+eb6J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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