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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072aea76b0d4a3c162e4b2d6840bebb52a611491f0123f47002cc0fba053f393' 
  AND token = 'V0uOQDEyOnIVzwwCe9x7Ufzh/PddFl1Mt6cyEIz9FOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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