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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8980337c20bc75978831a12e0a9723e0c0e0f4f78cd7f0e47d288cd64fc92c' 
  AND token = 'oGsInfCPFmJDak9L8BWZ3BafeiyO+qQ7DyjJeQywKwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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