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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624edf02cac8544bc5a203072b06728b6e9f97cd45b275362c21a6c3da88df24' 
  AND token = 'PImPugQFEBuZfqvSCtc/1+8BgiKyQfWex2gk4SK2S14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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