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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3decee4bf34793cb02b676912298833ca46e60e92941d41ce5e890e3cb4841ce' 
  AND token = 'iJVZBQv9iwWXFSNZJVFrfVg5bqBzQBM2N2aV8K3B8w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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