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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b8a19e0025553d0e6505f7c38c1d4a0a6b863eec4eeff5b6cd66e852f9ed4b' 
  AND token = 'R6YmysJOlMkPrJULF61Uc/lkdjGcaP6yfnnU8oKDt+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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