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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a35fa621ea0e036ae4f00f36f0a9544a150dc97dc0d36106c930a1b57e50502' 
  AND token = 'hG9zRD1chNjtPgOk/s9KSXfsKPea2+SGd6mgMONx2vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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