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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b1a326a6c419bac6f354e8be7a34296b34f3b0354bdee2ee760f15e5cbd113' 
  AND token = '47VpB1+rKy5RYX+AMRSjWCahpVDJL29rBMX0pOC2sVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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