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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebf32d3b88a8c1a0b1fe3d5777ed66cc166b95d0a1b014f2f6d2505707b1488' 
  AND token = 'jAKvOymvQObgfRbYefcSGH6SKMLRExTBc/ds9+Lcazw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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