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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea973c8d1f98969a6b3f9641e2c33db30fca5197202513e7029174c92f9e57b0' 
  AND token = 'b6IlSUbaMMbVmIF00ExDcn6ViM3vCKvVOYye0UH+ydA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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