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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ec3e1037521d6bc94c5085190e4c51ea96ea3eefaac5854ce374ad54af9f0c' 
  AND token = '6fxZeIsXzvJ3C86AL7Futj39tyTESE51JNiKfAldx6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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