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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1554cfd957df0f7eb0a70d038a0e4b9ed185f5f8b000162e69c3d20503205f4b' 
  AND token = 'aQFn7KRMEL8qnLtDYkB9WoTIsSsbPE0myAnwkokm6zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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