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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153011aefeec72debdd963dffdd4c34831377817c83e64cec88f02ec14e2b7dd' 
  AND token = 'y5PB7fe//9SbjlZFZ3YcmRnLCe4q71Fq4uYpJ1FBSaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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