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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa987aa5317027b28635f6acb064a166dad34d8c414f2c1fee0c89e3395b11ed' 
  AND token = '+KPcKws4GLgc1CkuGCmIGd1vvn+IKgba9FtyG8LZ1D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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